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<http://schema.org/description>
"H-Series Heated Head Dia-Vac® pump provides all of the features of the H-Series Dia-Vac® pump but has the added ability to electrically heat the pump head chamber."
<https://www.airdimensions.com/en-gb/products/h-series-dia-vac-pumps/h-series-heated-head-dia-vac-pump>